gh-128017: Make a note that sys variables are read-only (#128887)

srinivasreddy · web-flow · commit 313b96eb8b8d · 2025-01-16T11:17:03.000+01:00
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
@@ -8,7 +8,7 @@
 
 This module provides access to some variables used or maintained by the
 interpreter and to functions that interact strongly with the interpreter. It is
-always available.
+always available. Unless explicitly noted otherwise, all variables are read-only.
 
 
 .. data:: abiflags
